My 93' villager pulses hi -lo rpms about every 3 seconds when every the air control is on any setting. The problem stops when the OFF button is pressed. It happens at all speeds and with the airconditoner ON or OFF. It seems to be related to the airconditioner pump turning on and off. What steps should I take?

How does the AC air feel? Is it Ice Cold, cool, or moderate? Let me know. Reason for asking is the AC could be kicking off and on if the 134A (refridgerant) is low. This causing on and off would raise and lower your RPM's.

The Rev. AC

Thanks Rev. AC. It was a low level. The people at Part Source set me up with a kit that included the adaptor from R134a to R12, the gauge and canisters. the problem was solved in one canister.